Electric sadiron



March 12, 1935. e. BROWNING 1,993,956

ELECTRIC SADIRON Filed June 10, 1931 3 Sheets-Sheet 1 win/$221M March12, 1935. G. BROWNING ELECTRIC SADIRON Filed June 10, 1931 3Sheets-Sheet 2 March 12, 1935.

G. BROWNING ELECTRIC SADIRON Filed June 10, 1931 3 Sheets-Sheet s aspossible.

Patented Mar. 12, 1935 UNITED STATES PATENT OFFICE ELECTRIC SADIBONcorporation of Illinois Application June 10, 1931, Serial No. 543,433

20 Claims.

This invention relates to electric irons of the automatic type and hasparticular reference to irons having improved means for maintaining auniform temperature in the sole plate.

In the manufacture of electric sadirons it is essential that the heatingelement be placed close to the sole plate so that the heat will betransmitted to the ironing surface thereof as rapidly When the iron isidle and is first connected to a source of electrical energy, the soleplate should heat up more rapidly than the pressure weight situated onthe opposite and upper side of the heating element. While heat will betransmitted outward from both sides of the heating element it isdesirable to cause as much as possible of the heat to be transmitted tothe sole plate, since the purpose of the whole mechanism is to maintainthe ironing surface of thesole plate at a suitable ironing temperatureunder all conditions of use and the major dissipation of heat occurs atthe ironing surface of the sole plate. When the iron is put into actualuse the ironing surface of the sole plate comes into contact with coldor damp material and the heat is rapidly drawn from the surface of thesole plate. This tends to rapidly reduce the temperature of the plate.However, during operation, heat is being supplied to the sole plate fromthe heating element and is also being supplied to the pressure weightabove. There is, therefore, a wide difference between the amount of heatdissipated from these members while the heat being supplied thereto ismuch more nearly equal. For this reason, the temperature of the pressureweight increases while, under severe conditions,

the temperature of the sole plate decreases which often renders itnecessary, when ironing heavy damp pieces, to discontinue ironing or toslow down temporarily to allow the ironing surface of the sole plate toregain suflicient heat for eflicient ironing.

With the automatic irons now in common use, the usual thermostatic bladeor heat control device is intended to be set so that it will separatethe contacts and turn the current off when the ironing surface of thesole plate reaches a predetermined high temperature of not more thanabout 550 or 600. However, when the iron is connected to a source ofelectricity, the sole plate heats up more rapidly than the pressureweight and, in order that the sole plate will not exceed an initialpredetermined high temeprature of 550 or 600, it has been found that thethermostatic blade must be set so that it will separate and turn off thecurrent when the blade itself has reached a temperature of about 500.Now, when the iron is placed into service with the ironing surface ofthe sole plate in contact with the cold damp cloth, heat is rapidlydrawn from the sole plate at a rate greater than it is being replaced,whereas, heat is being supplied to the pressure weight at a greater ratethan it is being dissipated therefrom, whereby the temperature of thepressure weight increases to from 650 to 750. This excessive heat of thepressure weight is transmitted to the thermostatic blade and. raises itabove 500 thereby causing it to separate the contacts and turn off thecurrent while the actual temperature of the ironing surface may be onlyabout 350. Thus, the current is shut off when it is essential that itremain. on to allow the maximum volume of electricity to continueflowing through the iron and supply more heat to the ironing surface ofthe sole plate for use in the ironing operations.

I have, therefore, aimed to provide an electric iron having improvedmeans for maintaining the sole plate thereof at a uniform temperature.

Another object of the invention is to provide an automatic electric ironhaving means for keeping the sole plate at a uniform temperatureregardless of the temperature of the pressure weight.

Another object of the invention is to provide means in an automaticelectric iron for varying the setting of the primary heat control mechanism when the pressure weight reaches or exceeds a predeterminedtemperature.

A still further object of the invention is the provision of an electriciron having thermostatic means for shutting off the electric currentwhen the sole plate has reached a predetermined temperature and asecondary thermostatic means for preventing the current from being shutoil through the effect of temperatures other than that of the soleplate.

Another object of the invention is the provision of an electric ironhaving improved means for directing the heat from the heating elementinto the sole plate thereof.

A still further object of the invention is the provision of an automaticelectric iron having improved means for setting the primary thermostaticcontrol.

Other objects and attendant advantages will become apparent to thoseskilled in the art from the following description and the accompanyingdrawings, in which Figure 1 is a vertical elevation partly in seciiition of an electric iron embodying my invention;

Fig. 2 is a top view partly in section;

Fig. 3 is a section on the line 33 of Fig. 2, showing the parts in theirrelative position when cool;

Fig. 4 is a section on the line 4-4 of Fig. 1;

Fig. 5 is a section substantially similar to Fig. 3 showing the parts inthe relative positions they, occupy when the iron reaches its normaloperat-' ing temperature;

Fig. 6 is a section on the line 66 of Fig. 5 showing the position of thesecondary thermostatic device when the iron has just reached its normaloperating temperature;

Fig. '7 is a section similar to that shown in Fig. 5 showing therelative position of the parts when the pressure weight has reached asuper-heated condition;

Fig. 8 is a section on the line 8-8 of Fig. 7 showing the position ofthe secondary thermostatic device when the pressure weight has reached asuper-heated condition; and

Fig. 9 is a perspective view of the insulating baffle plate.

The invention contemplates in a general way, the provision of anelectric iron having automatic primary temperature control mechanismsubstantially similar to that shown in the copending application ofHorace C. Wright, Serial No. 474,934, filed August 13, 1930, andsecondary temperature control mechanism adapted to automatically adjustthe above mentioned primary control mechanism to compensate for theeffect of overheating of the pressure weight.

Referring to the drawings, the iron consists of a sole plate designatedgenerally by the numeral 11 having a pressure weight 12 secured to theupper side thereof by means of bolts 13 and 14. A handle 15, supportedupon a handle strap 16, is secured to the pressure weight 12 by means ofscrews 17 and 18, a cover 19 surrounding the pressure weight 12, beingpressed downward against-the sole plate 11 by the tightening of thescrews 17 and 18. A heat indicating slide 21 is slidably clamped aboutthe handle strap 16 and serves to support a manual control handle 22 andan adjusting pin 23, the slide 21 and the pin 23 being arranged to bemoved longitudinally of the strap 16 by rotation of the handle 22 forthe purpose of regulating the desired temperature of the sole plate. Thelower end of the pin 23 engages a secondary thermostatic devicepresently to be described. A heel rest 24 is secured to the cover 19 atthe rear end of the iron and serves to support the iron in asubstantially vertical position when not in use, so that the sole plate11 will be elevated out of contact with combustible material.

The heel rest and the primary thermostatic. control mechanism beingshown and described in detail in the above mentioned copendingapplication, it will suflice here to refer to the same in general terms.This device consists of an upper contactor bar 25 and a lower bimetalliccontactor bar 26. The upper contactor bar 25 is provided with a pair ofspaced ears 27 at one end adapted to pivotally receive a pin 29 fixedlysecured in the side walls of a thermostatic mounting bridge designatedgenerally by 31. The contactor bar 25 is provided with a further pair ofspaced ears 32 intermediate its ends adapted to receive and be actedupon by a secondary thermostatic device presently to be described. Theforward end of the contactor bar is provided with a downwardlyprojecting contact point 33. Electric contact is made from a terminal 34through the contactor bar 25 to the terminal point 33 by means of a lead35 between the terminal 34 and the bar 25.

The lower contactor bar 26 consists of a bimetallic strip having acontact point 36 at one end thereof adapted to make-contact with thecontact point 33 of the upper contactor bar and a pair of ears 37 at therear end thereof pivotally supported on the pin 29. A rearwardlyprojecting lever 38 is secured thereto and adapted to be engaged by aspring 39 for maintaining the contact point 36 against the contact point33 during the initial heat period of the iron. The contactor bar iselectrically connected to the heating element 41 by means of a lead 42.The heating element 41 is in turn electrically connected to terminal 43to complete the electric circuit through the iron. As the sole plate 11of the iron is heated by the heating element 41, heat is communicated tothe lower contactor bar 26 which tends to draw the contact point 36 awayIfarom the contact point 33 of the upper contactor the lever-38 thereofmaintaining the two contact points together until rotation of the lowercontactor bar is stopped as will presently be described. When thisrotation is stopped, a further rise in temperature of the sole platewill cause the contact points 33 and 36 to separate, thereby shuttingoff the current through the heating element 41.

Improved means are herein provided for stopping the rotation of thelower contactor bar when the desired temperature is reached. Thisconsists of a screw 44 having a cone shaped head 45, the screw havingthreaded engagement with a thread opening 46 in the rear of the soleplate 11. A slot 4'! permits the screw 44 to be turned to project thehead 45 outward or retract it, to vary the amount of movement which maybe imparted to the lever 38. It will be seen from Figs. 3, 5 and 7 thatthis adjustment may be carried out without otherwise disturbing theparts of theiron. That is, access need not be had to the interior of theiron to make this adjustment. On the other hand, the adjustment cannotbe accidentally disturbed since the slot 47 is substantially concealedwithin the opening 46.

Means are provided for manually raising or lowering the contact bar 25and thereby the contact point 33 through the ears 32. Each of these earsis provided with a slot 43 adapted to slidably and rotatably receive apin 49. The pin 49 is fixedly positioned in spaced cars 51 on a verticallever 52, the lever 52 beingpivotally supported on a pin 53 secured atopposite ends in the side walls of the thermostatic mounting bridge 31.The upwardly projecting lever 52 ends in a horizontal portion 54. Thehorizontal portion 54 is provided with a slot 55 best shown in Figs. 6and 8 adapted to receive the pin 23 which is provided with acircumferential depression 56 at the point of contact with the portion54, and with a conical end 57. A horizontal bar 58 having its upper edgesubstantially parallel with the portion 54 projects laterally outwardand is secured to'the upper end of the lever 52 by means of a rivet 59.A bimetallic element 61 is riveted at one end to the outer end of thebar 58 as shown at 62 and normally lies in parallelly disposed relationwith the bar 58. At the opposite end of the bimetallic element 61, aright angle plate 63 is secured providing sumcient clearance from theelement 61 to receive the cone-shaped end 57 of However, the contactorbar 26 is rotatedabout the pin 29 by action of the spring 39 upon theadjusting pin 23. Thus to manually adjust the operating temperature ofthe sole plate to a desired point, the lever 22 is rotated, moving thepin 23 longitudinally of the iron in the opening 60 of the cover,thereby raising or lowering the contact point 33. *Automatic means,responsive to the temperature of the pressure weight 12 independent ofthe setting of the handle 22 is also provided in the same mechanism foras the bimetallic or thermostatic element 61 is warped,

' as shown in Fig. 8, by the effect of temperature,

the, lever 52-wm be moved to the left facing Figs. 6 and 8, since pin 23is held stationary in any position fixed by the handle 22, and theportion 54 will move with respect to the pin 23 to the limiting positionshown in Fig. 8. The slot 55 thus determines two limiting positions inwhich the pin 23 comes into contact with opposite ends of the slot, onein which the pressure weight is at the normal operating temperature ofthe sole plate or lower, and the other limiting the amount to which theprimary thermostat may be set up by superheating of the pressure weight.

In operation it will be seen that the thermostatic element 61 serves toset up or advance the contact bar 25 in proportion to the super-heatingof the pressure weight 12. In order to make the thermostatic element 61as highly responsive as possible to the temperature of the pressureweight, a slot 64 is formed in the top of the pressure weight ofsufilcient width to permit the necessary movement of the bar 58, and thether mostatic element 61 is positioned in this slot on the laterallyextending bar 58. It will be seen that by this arrangement thethermostatic ele-' ment 61 is made subject, on three sides, to the heatemitted by the pressure weight.

Assuming that the iron is cold and has just been connected to a suitablesource of electrical energy, the parts will occupy the position shown inFigs. 3 and 6. As the current fiows through the heating element 61 andthe sole plate 11 is heated to operating temperature, as determined bythe setting of the handle 22, the lower contactor bar 26 moves to thesolid line position shown in Fig. 5 in which the lever 38 is in contactwith the head 45 of the screw '44 thereby preventing further rotation ofthe lower contactor bar. As the temperature of the sole plate increasesbeyond this point, the contactor bar 26 moves to the dotted line shownin this figure, in which the current is shut off by separation of thecontact points 33 and 36. It will be observed that the secondarythermostatic element 61 still occupies the position shown in Fig. 6,since this 'element does not begin to function until the pressure weightequals or exceeds substantially the temperature at which it is desiredto maintain the sole plate.

If the iron is now placed on a surface with the sole plate 11 in contactwith cold damp material to be ironed, the temperature of the sole platewill rapidly decrease and will correspondingly affect the primarythermostatic element in the lower contactor bar 36 thereby againbringing the contactor point 36 into contact with the contact point 33,and again turning on the current. In the meantime, however, the pressureweight 12 will have had but very little of its heat dissipated so thatthe renewal of the supply of heat from the heating element will furtherincrease the temperature thereof, while the ironing operations willcontinue to maintain the temperature of the sole plate at a relativelylow point. As the temperature of the pressure weight increases, the

tendency of the weight to supply heat to the primary thermostaticelement. of the contactor bar 26 increases until it reaches a'point atwhich heat from this source alone will normally be sumcient to separatethe contact points 33 and 36, regardless of the temperature of the soleplate 11. This is the state of afiairs customarily reached withautomatic irons of conventional construction when they are used, undersevere conditions such as in the rapid ironing of cold damp material ofheavy texture. At vthis point, the current will be switched off. eventhough the sole plate is at a very low temperature and the supply ofheat from the heating element will be discontinued at the very time whenit is needed most.

' However, with my improved construction, as soon as the temperature ofthe pressure weight increases beyond the temperature for which the ironis set, the secondary thermostatic element 61 begins to function and iscaused to warp by the heat of the pressure weight. As this warpingcontinues, the lever 52 and portion 54 are moved forward therebyrotating the ears 51 and the pin 49 about the pin 53. This rotation,acting through the ears 32 rotates the upper contact bar 25 about thepin 29 to lower the contact point 33. This lowering of the contact point33 is accomplished in proportion to the excess of temperature possessedby the pressure weight. Thus, the greater the thermal eifect of thepressure weight upon the primary thermostatic element, the further willthe contact point 33 be lowered. Thus during the most severe conditionsof operation, the parts will occupy the positions shown in Figs. 7 and 8in which the portion 54 has moved until the end. of the slot 55 is incontact with the pin 23. This acts as a stop to prevent excessivemovement of the contact point 33 beyond thenormal capacity of thedevice. Thus, the function of the secondary thermostatic element 61 andassociated parts is to so move the contact point 33 as to compensate forthe thermal effect of the pressure weight upon the primary thermostaticelement, leaving the primary thermostatic element effectively responsivesolely to the thermal condition of the sole plate.

In order to cause an increased percentage of the heat emitted by theheating element 41 to be transmitted to the sole plate, I have providedan insulating baille plate designated generally by 66, adapted to bepositioned between the heating element 41 and the lower side of thepressure weight 12. This may properly consist of a sheet metal plate ofsuitable shape characteristics provided with a plurality of upstandingconical projections 67 arranged to support the pressure weight in spacedrelation to the heating element and provide an insulating air spacetherebetween. This space acts as an insulator and tests have shown thatan iron fitted with this baille plate above the heating element throwsthe heat to the sole plate more rapidly and the sole plate reaches adesired temperature quicker than ondary thermostatic element so that itdoes not start to function until a higher temperature is reached.

It will be seen from the foregoing that I have provided an iron havingimproved automatic means for controlling the temperature of the soleplate and accordingly of the ironing surface, the means being such as toprevent the current from being shut off from the heating element whilethe sole plate is below its desired operating temperature because of thethermal effect of the super-heated pressure weight. It will be seen thatthis secondary thermostatic element acts independently of the manualadjusting handle 22. This means that the control mechanism may be set byrotating the handle 22 to maintain the sole plate of the iron at a lowmedium or high temperature as desired, which will, of course,

depend upon the type of work to be done withthe iron, after which theprimary and secondary thermostatic elements will function to maintainthe sole plate substantially at this temperature during the ironingoperations. As a result of my invention it is possible to maintain thesole plate at a temperature much nearer a desired operating temperaturethan has heretofore been possible. The provision of the baille platebetween the heating element and the pressure weight has furtherfacilitated a maintenance of the desired temperature in the sole plateunder severe conditions. In addition, improved means have been providedfor limiting the rotary movement of the lower contact bar, the meansbeing such as to be capable of adjustment without dismantling the ironin any way.

While I have thus described and illustrated a specific embodiment of myinvention, I am aware that numerous alterations and changes may be madetherein without materially departing from the spirit of the invention orthe scope of the appended claims, in which- I claim:

1. An electric sadircn comprising a heating element, a sole plate, aprimary heat responsive mechanism responsive to the temperature of saidsole plate for controlling said heating element, and a secondary heatresponsive means for altering the setting of said primary heatresponsive means in response to an increase in temperature of a remotepart of the iron above a predetermined normal.

2. An electric sadircn comprising a heating element, a sole plate, abimetallic element responsive to the temperature of said sole plate, apair of contact points arranged through contact to close an electriccircuit through said heating element, one of which is positioned on saidhimetallic element, manually operable means for adjusting the positionof the second of said contact points, and heat responsive meansthermally responsive to other portions of said iron associated with saidlast mentioned means for altering the position of said second contactpoint to compensate for variations in temperature of said other portionsof the iron.

3. An electric sadiron including, in combination, an iron structurehaving an ironing surface, an electric heating element, thermostaticmeans within said structure in close proximity to said ironing surfaceand responsive to the temperature thereof to turn said heating elementoff and on at a predetermined temperature, and a second thermostaticmeans responsive to the temperature of other portions of the iron forvarying the setting of said first mentioned thermostatic means tocompensate for the thermal effect of said other portions upon said firstmentioned thermostatic means and render it effectively responsive solelyto said ironing surface.

4. An electric sadiron comprising, in combination, a sole plate, apressure weight, a heating element, heat responsive means in closeproximity to said sole plate to regulate said heating element andmaintain a constant operating temperature in said sole plate andsecondary heat responsive means positioned to be thermally acted upon bysaid pressure weight for varying the setting of said first mentionedheat responsive means to compensate forthe thermal effect of saidpressure weight upon said first mentioned heat responsive means.

5. An electric sadiron comprising, in combination, a sole plate, apressure weight, a heating element, heat responsive means in closeproximity to said sole plate to regulate said heating element andmaintain a constant operating temperature in said sole plate, means formanually changing the setting of said heat responsive means to altersaid constant temperature and secondary heat responsive means interposedbetween said first mentioned heat responsive means and said manual meanspositioned to be acted upon by the heat of said pressure weight tocompensate for the thermal eifect of said pressure weight upon saidfirst mentioned heat responsive means, regardless of the position ofsaid manually operated means.

6. An electric sadiron comprising, in combination, an iron structurehaving an ironing surface, a manually adjustable contact point, athermostatically adjustable contact point arranged to automaticallyregulate the temperature of said iron by contact with said firstmentioned contact point through the thermal effect of said ironingsurface, manually operable means for varying the distance between saidcontact points through movement of said first mentioned contact point,and thermostatic means responsive to the temperature of portions of saidiron remote from said ironing surface for moving said first mentionedcontact point to compensate for the thermal effect of said remoteportions upon the position of said thermostatically adjustable contactpoint.

7. An electric sadiron comprising, in combination, a sole plate, apressure weight, an electric heating element, a rotatably adjustablecontactor bar, a contact point positioned upon said contactor bar, abimetallic contactor bar positioned in close proximity to said soleplate, a contact point on said bimetallic contactor bar adapted to bebrought into and out of contact with said first mentioned contact pointby the thermal effect of said sole plate, to regulate the flow ofelectric current through said heating element, manually operable meanssecured to said first mentioned contactor bar for moving said firstmentioned contact point to vary the normal temperature of said iron, andthermostatic means responsive to the temperature of said pressure weightfor automatically altering the position of said first mentioned contactpoint to compensate for the thermal effect of said pressure weight uponsaid bimetallic contactor bar.

8. The combination in an electric iron having an ironing surface, a pairof contact points and thermostatic means responsive to the temperatureof said ironing surface for moving said points into and out of contactto regulate the temperature of said ironing surface, of temperatureadjusting means comprising a lever for moving one of said I contactpoints toward and away from the'other, a

manually operative handle positioned to be moved between a plurality oftemperature indicating positions, and thermostatic means interposedbetween said lever and said handle for moving said lever in response tomovement of the handle to set said contact point for desiredtemperatures, and for moving said lever independently of said handle tomove said contact point to compensate for the thermal effects upon saidfirst mentioned thermostatic means of portions other than said ironingsurface.

9. The combination in an electric sadiron having a sole plate and apressure weight, of a pair of contact points and thermostatic meansresponsive to the temperature of said sole plate for moving said pointsinto and out of contact to regulate the temperature of said sole plate,and temperature adjusting means comprising a lever for moving one ofsaid contact points toward and away from the other, a manually operablehandle positioned to be moved between a plurality of temperatureindicating positions, and a bimetallic element connecting said lever andsaid handle, said element serving to move said lever in response tomovement of the handle to set said contact point for desiredtemperatures and also serving to move said first mentioned leverindependently of said second lever also serving to move said contactpoint to compensate for the thermal effect of said pressure weight uponsaid first mentioned thermostatic means.

10. The combination in an electric sadiron having a sole plate and apressure weight, of a pair of contact points and thermostatic meansresponsive to the temperature of said sole plate for moving said pointsinto and out of contact to regulate the temperature of said sole plate,and temperature adjusting means comprising a lever for moving one ofsaid contact points toward and away from the other, a manually operablehandle positioned to be moved between a plurality of temperatureindicating positions, and a secondary thermostatic element connectingsaid lever and said handle, positioned to be efilciently thermallyresponsive to said pressure weight and serving to move said lever inresponse to movement of the handle to set said contact point for desiredtemperatures also serving to move said lever independently of saidhandle to move said contact point and compensate for the thermal eifectof said pressure weight upon said first mentioned thermostatic means.

- 11. The combination in an electric sadiron having a sole plate and apressure weight provided with a slot, of a pair of contact points andthermostatic means responsive to the temperature of said sole plate formoving said points into and out of contact to regulate the temperatureof said sole plate, and temperature adjusting means comprising apivotally supported bell crank lever having one end connected to moveone of said contact points toward and away from the other, a manuallyoperable handle positioned outside said iron to be moved be tween aplurality of temperature indicating positions, means connected theretoand projecting into the iron arranged to move longitudinally thereof bymovement of said handle, a laterally projecting arm connected to saidlever and extending into said slot, 3. bimetallic element con nected atone end to the end of said arm within said slot and lying in parallellydisposed relation thereto, and pivotal means for connecting the free endof said element with said last mentioned means, said elements serving tomove said lever in response to movement of the handle to set saidcontact point for desired temperatures, and also serving to move saidfirst mentioned lever independently of said handle to move said contactpoint and compensate for the thermal effect of said pressure weight uponsaid first mentioned thermostatic means.

12. The combination in an electric sadiron having a sole plate and apressure weight, of a pair of contact points and thermostatic meansresponsive to the temperature of said sole plate for moving said pointsinto and out of contact to regulate the temperature of said sole plate,and temperature adjusting means comprising a lever for moving.one ofsaid contact points toward and away from the other, a manually operablehandle positioned to be moved between a plurality of temperatureindicating positions, and a bimetallic element connecting said lever andsaid handle, said element serving to move said lever in response tomovement of the handle to set said contact point for desiredtemperatures and also serving to move said lever independently of saidhandle to move said contact point and compensate for the thermal effectof said pressure weight upon said first mentioned thermostatic means.

13. The combination in an electric sadiron having a sole plate and apressure weight provided with a slot, of a pair of contact points andthermostatic meansresponsive to the temperature of said. sole plate formoving said points intoand out of contact to regulate the temperature ofsaid sole plate, and temperature adjusting means comprising a pivotallysupported bell crank lever having one end connected to move one of saidcontact points toward and away from the other, a manually operablehandle positioned outside said iron to be moved between a plurality oftemperature indicating positions, means connected thereto and projectinginto the iron arranged to move longitudinally thereof by movement ofsaid handie, a laterally projecting arm connected to said lever andextending into said slot, a bimetallic element connected at one end tothe end of said arm within said slot and lying in parallelly disposedrelation thereto, and pivotal means for connecting the free end of saidelement with said last mentioned means, said element serving to movesaid lever in response to movement of the handle to set said contactpoint for desired temperatures, and also serving to move said leverindependently of said handle to move said contact point and compensatefor the thermal elTect of said pressure weight upon said first mentionedthermostatic means, and means acting between said lever and said meansconnected to said handle for limiting the independent movement of saidlever.

14. An electric sadiron comprising a sole plate having a threadedopening extending from the exterior to the interior of the iron, aheating element therefor, a thermostat including a contact point movablein response to temperature changes, a contact point cooperable therewithand a rotatable contact bar carrying one of said points, a stop membertherefor arranged to be projected and retracted on the interior of theiron from outside the iron to determine the maximum rotative position ofsaid bar to determine the opening temperature of said contact engagementby a screw driver for moving said head and adjusting the normaloperating position oi. said bar, said stop member being of such lengththat said slot falls within and between the ends of the threaded openingto prevent accidental or malicious tampering with said stop member.

15. An electric sadiron comprising a heating element, a sole plate, aprimary heat responsive mechanism responsive to the temperature of saidsole plate for controlling said heating element, a secondary heatresponsive means for altering the setting of said primary heatresponsive means in response to an increase in temperature of a remotepart of the iron above a predetermined normal, and means for limitingthe amount of such alteration.

16. An electric sadiron comprising a sole plate, a pressure weight, aheating element, a primary heat responsive mechanism for controllingsaid heating element, and a secondary heat responsive means inoperativeat normal ironing temperature of the pressure weight but operative attemperatures thereabove to control the operation of the primary heatresponsive mechanism.

17. An electric sadiron comprising a heating element, a sole plate, apressure weight, a primary thermostatic means responsive to thetemperature of said sole plate for controlling said heating element,secondary thermostatic means responsive to said pressure weightunresponsive at temperatures below the normal operating temperature ofsaid pressure weight, said secondary thermostatic means acting attemperatures above said normal temperature to alter the setting of saidprimary thermostatic means.

18. An electric sadiron comprising a (heating element, a sole plate, apressure weight, a primary thermostatic means responsive to thetemperature of said sole plate to normally open and close the circuitthrough said heating element at.predetermined temperatures of said soleplate, and secondary thermostatic means responsive to the temperature ofsaid pressure weight acting at pressure weight temperatures above saidpredetermined temperatures to delay the opening or said circuit.

19. An electric sadiron comprising a heating element, a pressure weight,a sole plate, a bimetallic element thermally responsive to thetemperature of said'sole plate, contact points arranged through contactto close an electric circuit through said heating element, one or whichis positioned on said bimetallic element, manually operable means foradjusting the position of the second of said contact points, and heatresponsive means thermally responsive to the pressure weight to advancesaid second contact point in proportion to the excess 01 temperature ofsaid pressure weight above a predetermined normal operating temperature.l

20. An electric sadiron comprising a sole plate, an electrical heatingelement therefor, and thermostatic means for controlling the heatingelement comprising a contact point movable in response to changes intemperature of the sole plate, a contact point cooperable therewith, arotatable contact bar carrying one of said points, spring means forrotating said bar to maintain said points in contact upon movement ofsaid movable contact point under changing temperature, anda stopcomprising a threaded body portion positioned in said sole plate forrotation from outsidethe iron, and the tapered head portion inside theiron arranged by contact to stop the rotation of said bar at a pointdetermined by the position of said head.

GEORGE BROWNING.

CERTIFICATE OF CORRECTION.

Patent N0. 1,993,956. 9 March 12, 1935.

GEORGE BROWNING.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 5,first column,

- line 30, claim 9, strike out the words "also serving"; line 50, claim10, after "temperatures" insert the word and; second column, line 6,claim 11, strike out the words "first mentioned"; and that the saidLetters Patent should be read with these corrections therein that thesame may conform to the record of the case in the Patent Office.

Signed and sealed this 23rd day of April, A. D. 1935.

Leslie Frazer (Seal) Acting Commissioner of Patents.

' Patent No. l, 993, 956.

' CERTIFICATE OF CORRECTION.

March 12, 1935.

GEORGE BROWNING.

it is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 5,first colunm,

- line 30, claim 9, Strikeout the words "also serving"; line 50, claim10, after "temperatures" insert the word and; second column, line 6,claim 11, strike out the words "first mentioned"; and that the saidLetters Patent should be read with these corrections'thercin that thesame may conform to the record of the case in the Patent Office.

Signed and sealed this 23rd day of April, A. D. 1935.

Leslie Frazer (Seal) I Acting Commissioner of Patents.

